What percentage of the Indian area comes under moderate and high seismic zones?
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An earthquake is a tremor of varied intensity in the earth's surface caused by the action of the end genetic forces of the earth. It causes immense damage to life and property of the region if its intensity is measured over 7 on the Richter scale. Studies have shown that over 60% of the country's area comes under the moderate and high seismic zones. In the past, a number of devastating earthquakes have been caused. Tsunamis-Earthquake measuring more than 7 on Richter scale in the sea bed may produce high sea waves called tsunamis. Such tsunamis were caused due to the earthquake near Sumatra coast on 26th Dec. 2004, which led to a loss of more than 1.5 lakh people in Indonesia, Sri Lanka and India. In India, heavy damage to life and property was caused in Andaman-Nicobar islands and Tamil Nadu coast. Severity of the tsunamis was a little minimised along the coasts having wider continental shelves and luxuriant growth of mangrove forests. Since Andaman area lies in the high seismic zone, the recurrence of tsunamis is not ruled out. The need is early warning system, planting of mangroves and building of protection walls.